CN108181190A - A kind of dissimilar material tack-weld fatigue limit method for quick predicting - Google Patents
A kind of dissimilar material tack-weld fatigue limit method for quick predicting Download PDFInfo
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Abstract
The invention discloses a kind of dissimilar material tack-weld fatigue limit method for quick predicting, are related to welding structure fatigue reliability assessment technical field.This method includes：By determining the fatigue temperature rise slope in the phase III corresponding to each load level；Multiple fatigue temperature rise slopes by specified rule are divided, obtain two groups of fatigue temperature rise slope datas；Linear fit is carried out respectively to two groups of fatigue temperature rise slope datas and obtains two straight lines, using the load-carrying water level values corresponding to the intersection point of two straight lines as the fatigue limit predicted value of dissimilar material tack-weld, namely, the critical point that magnitude of load corresponding to temperature rises slope appearance turnover is changed as Fatigue Damage Mechanism, and the fatigue limit of dissimilar material tack-weld is predicted with this, the fast prediction of dissimilar material tack-weld fatigue limit can be realized by the method for the present invention, result has authenticity, reliability.
Description
Technical field
The present invention relates to welding structure fatigue reliability assessment technical fields, more particularly relate to a kind of dissimilar material spot welding
Joint fatigue limit method for quick predicting.
Background technology
At a high speed, main feature that is heavily loaded, energy saving, safe, being comfortably modern railway traffic transport, and structure lightened is real
The effective way of existing above-mentioned target.SUS301L austenitic stainless steels train by it from heavy and light, anticorrosive property is good, tensile strength
The advantages that high, beautiful safe, obtains extensive use；Q235 mild steel solderability is good, and has hardenability, mild steel most absolutely
Welding point and heat affected area hardness are all higher than base material.Part body part is using stainless steel and the company of carbon steel dissimilar material spot welding
Method is connect, the two advantage can be comprehensively utilized and traditional thin plate arc welding is overcome to lead to strength of joint due to welding deformation is big
The problem of reduction.But the overload mechanical property of two kinds of materials and fatigue behaviour and fracture mechanism are entirely different, therefore the two point
The reliable prediction of plumb joint fatigue limit is an extremely important link in its structured design process.
In recent years, infrared thermal imagery method is gradually learned both at home and abroad by the advantages that its whole audience, real-time, non-contact and non-demolition
The favor of person, and apply it in the research of fatigue limit.And the existing forecasting fatigue method based on Infrared Thermography Technology
Risitano single line methods and Luong Double-Line Methods, Risitano etc. is based primarily upon to concentrate on studies by 15 years, send out now above
Under the load effect of fatigue limit, the temperature value of temperature stabilization sub stage and magnitude of load have approximately in fatigue of materials destructive process
Linear relationship；And in the case where being acted on less than the load of fatigue limit, the temperature change very little of material, the fatigue limit of material can lead to
It crosses and draws the linear relation under different loads level between the temperature rise value of temperature stabilization sub stage and load to determine.Luong etc. is ground
Study carefully discovery, although fatigue rupture will not occur when plus load is less than fatigue limit, nonplastic effect is (such as viscosity effect
Should) it can equally cause temperature change, by the way that two groups of temperature datas above and below fatigue limit are carried out linear fit, obtain
The intersection point of two straight lines is exactly the fatigue limit of material.
However the tack-weld of tack-weld especially dissimilar material, on the one hand easily generate nugget offset；On the other hand
Since the position of cyclic loading is located at nugget central interior, Temperature Evolution phenomenon of the nugget surface in fatigue process is difficult to supervise
It surveys.Above-mentioned factor causes dissimilar material tack-weld fatigue temperature rise Evolution and typical metal material and banjo fixing butt jointing rule
There are many differences.First, the fatigue temperature rise value of entire fatigue process is little, this is because the design feature of tack-weld in itself
And the geometric dimension of sample is determined, the position i.e. hot source point that tack-weld bears circulation shear stretching is located in nugget
The heart transfers heat to specimen surface using plate thickness direction, and heat dissipation is more, can only monitor several years even zero several years temperature rise value, but
This does not influence tired Temperature Evolution overall trend and the further investigation being unfolded therefrom；Again, it is quick by first stage temperature
The formed peak value of raising is far below the corresponding peak value of final fracture, this is because tack-weld is tried with simple metal or banjo fixing butt jointing
Sample is compared, and bearing capacity is low, and application load is small, and the mechanical energy of external world's input is few；In addition, do not occur temperature stabilised platform rank
Section, for occupying the phase III of entire fatigue process overwhelming majority cycle, temperature is one and stablizes raised process, and entire
The fatigue temperature rise slope of phase III is a stationary value, and the second stage for Typical Metals " three phases " do not occur is put down
Platform, therefore Risitano single line methods and Luong Double-Line Methods cannot be applicable in dissimilar material tack-weld fatigue limit fast prediction.
Invention content
The embodiment of the present invention provides a kind of dissimilar material tack-weld fatigue limit method for quick predicting, existing to solve
Technology Risitano single line methods and Luong Double-Line Methods cannot be applicable in asking for dissimilar material tack-weld fatigue limit fast prediction
Topic.
The embodiment of the present invention provides a kind of dissimilar material tack-weld fatigue limit method for quick predicting, including：
S1, one layer of uniform black matte paint is sprayed on fatigue testing specimen surface, the radiance of the black matte paint is 0.9；
Wherein, the fatigue testing specimen is prepared for dissimilar material tack-weld；
S2, the stainless steel side nugget for monitoring dissimilar material tack-weld in real time using thermal infrared imager and plasticity ring surface office
The temperature of portion's hot spot；
S3, the primitive relation for determining fatigue temperature rise and cycle cycle under different loads level；Wherein, the fatigue temperature rise is
The stainless steel side nugget of dissimilar material tack-weld and the maximum temperature of plasticity ring surface hot localised points and environment maximum temperature
Difference；
S4, multiple fatigue temperature rises are filtered with recycling the primitive relation of cycle, obtained different loads
Evolution trend of the lower fatigue temperature rise of level with recycling cycle；Wherein, the fatigue temperature rise includes with recycling the evolution trend of cycle
Four-stage, first stage are the quick boost phase of temperature, and second stage is the temperature decline stage, and the phase III stablizes for temperature
Boost phase, fourth stage are cooling stage；
S5, the fatigue temperature rise slope corresponding to each load level in the phase III is determined；Wherein, the fatigue temperature rise is oblique
Rate is to recycle the fatigue temperature rise knots modification that cycle recycles million times；
S6, multiple fatigue temperature rise slopes by specified rule are divided, obtains two groups of fatigue temperature rise slope datas；
S7, it two groups of fatigue temperature rise slope datas is carried out with linear fit respectively obtains two linear equations, and by two straight lines
Load-carrying water level values corresponding to intersection point are the fatigue limit predicted value of dissimilar material tack-weld.
Preferably, the linear fit that carried out respectively to two groups of fatigue temperature rise slope datas obtains two linear equations difference
For：
θ1=0.000278567F+0.12346
θ2=1.12259F-6.12676
Wherein, F is load level, θ1Slope, θ are risen for the first temperature2Slope is risen for the second temperature.
Preferably, described divided multiple fatigue temperature rise slopes by specified rule, obtain two groups of temperature and rise slope data
Including：
Slope is risen to temperature and is divided into one group less than or equal to specified threshold；
Slope is risen to temperature and is divided into one group more than specified threshold.
Preferably, it is further included after the step S7：
S8, dissimilar material tack-weld is predicted using staircase method, obtains fatigue limit test value；
S9, the fatigue limit predicted value and the fatigue limit test value are compared, obtain error amount.
Preferably, the dissimilar material is that the SUS301L stainless steels of 4mm and Q235B mild steel form by thickness.
Preferably, the sensitivity of the thermal infrared imager is less than 0.03 DEG C, temperature range is -20 DEG C~1200 DEG C, image
Capture frequency is 9Hz.
In the embodiment of the present invention, by determining the fatigue temperature rise slope in the phase III corresponding to each load level；It is right
Multiple fatigue temperature rise slopes are divided by specified rule, obtain two groups of fatigue temperature rise slope datas；It is oblique to two groups of fatigue temperature rises
Rate data carry out linear fit and obtain two straight lines respectively, are dissimilar material point by the load-carrying water level values corresponding to the intersection point of two straight lines
The fatigue limit predicted value of plumb joint, that is, temperature is risen slope the corresponding magnitude of load of turnover occurs as fatigue damage machine
The critical point to change is made, and the fatigue limit of dissimilar material tack-weld is predicted with this, due to the predicted value and test value
It is 5.21% to carry out the error that comparison obtains, has higher consistency, and therefore, the present invention can realize that dissimilar material is spot welded
The fast prediction of head fatigue limit, result have authenticity, reliability.
Description of the drawings
Fig. 1 is dissimilar material tack-weld specimen size provided in an embodiment of the present invention；
Fig. 2 is a kind of fatigue of dissimilar material tack-weld fatigue limit method for quick predicting provided in an embodiment of the present invention
Test temp measuring system；
Fig. 3 is a kind of flow of dissimilar material tack-weld fatigue limit method for quick predicting provided in an embodiment of the present invention
Schematic diagram；
Fatigue temperature rise of Fig. 4 fatigue testing specimens provided in an embodiment of the present invention when load level is 7.0KN and cycle cycle
Graph of relation；
Fig. 5 is fatigue temperature rise of the labor sample provided in an embodiment of the present invention under different loads level and cycle cycle relationship
Curve graph；
Fig. 6 is a kind of dissimilar material tack-weld fatigue limit prognostic chart provided in an embodiment of the present invention；
Fig. 7 is the result of the test provided in an embodiment of the present invention predicted using staircase method dissimilar material tack-weld
Figure.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment shall fall within the protection scope of the present invention.
The test material and equipment of the embodiment of the present invention
It is the SUS301L stainless steels of 4mm and Q235B mild steel that thickness is selected in experiment, and the overlap joint for carrying out dissimilar material is double
Face single spot welding, nominal chemical composition and main mechanical properties are as shown in table 1, table 2.In order to ensure quality of weld joint, welding
Before butt-welding fitting surface is needed to be cleared up, to remove surface foul and oxidation film, obtain small and uniform contact resistance, this is
Electrode adhesion, splash are avoided, ensure point quality and tests the major prerequisites of stability.Spot-welding test is on hanging spot-welder
It carries out, electrode material CrZrCu, electrode diameter 22mm, electrode tip spherical radius is 100mm, electrode travel 30mm.Point
Postwelding carries out appearance test according to JIS Z3140-2000, JIS Z3139-2000 standards, smoothness is examined and section is examined.
1 test material name chemical composition of table
2 test material main mechanical properties of table
In the embodiment of the present invention, SUS301L-Q235B dissimilar materials tack-weld is selected as fatigue testing specimen, and fatigue is tried
The tired Temperature Evolution experiment of sample carries out on PLG -200D HF fatigue testing machines, according to ISO14234-2003 standards, fatigue
Specimen size (unit as shown in Figure 1：Mm), sample is longitudinally plate rolling direction, and plate test film edge need to be modified suitably, is tried
Part requirement is symmetrical and with enough precision.
Specifically, in order to improve the radiance of metal surface, the uniform black matte of last layer is sprayed on fatigue testing specimen surface
Paint, radiance 0.9.Stress ratio R=0.1 during fatigue test, is loaded with sinus wave patters, specified life 2x106It is secondary.
Fig. 2 is a kind of fatigue of dissimilar material tack-weld fatigue limit method for quick predicting provided in an embodiment of the present invention
Temp measuring system is tested, which records tack-weld stainless steel side using the Ti450 thermal infrared imagers of Fluke companies of U.S. production
The temperature change of nugget and plastic area hot localised points, thermal infrared imager sensitivity are not more than 0.03 DEG C, temperature range -20~1200
DEG C, image capture frequency is 9Hz, and thermal infrared imager is placed at test coupon 30cm, vertical specimen surface shooting.
Mechanics Performance Testing, the tensile property parameter of US301L-Q235B dissimilar materials tack-weld is with determining in order to obtain
The level of initial load added by fatigue test takes three groups of samples to carry out static tension experiment, measures its tensile strength such as table 3 respectively
It is shown.As can be seen that under the selected technological parameter of experiment, the bias caused by spot welding lap joint feature itself is cut
Stretching action is cut, the tensile strength of tack-weld is less than base material.
3 US301L-Q235B dissimilar material tack-weld static tension performances of table
Fig. 3 is a kind of flow of dissimilar material tack-weld fatigue limit method for quick predicting provided in an embodiment of the present invention
Schematic diagram.As shown in figure 3, this method includes:
S1, one layer of uniform black matte paint is sprayed on fatigue testing specimen surface, the radiance of the black matte paint is 0.9；Its
In, which is prepared for dissimilar material tack-weld.
S2, the stainless steel side nugget for monitoring dissimilar material tack-weld in real time using thermal infrared imager and plasticity ring surface office
The temperature of portion's hot spot.
In embodiment, to SUS301L-Q235B dissimilar material tack-weld fatigue testing specimens under different loads level into
Row high frequency La-drawing load fatigue test, chooses 5.0KN, 5.5KN, 6.0KN respectively, 6.5KN, 7.0KN, 7.5KN, 8.0KN totally seven
A load level.It tests simultaneously, by high-performance thermal infrared imager to tack-weld SUS301L stainless steels side nugget and plastic area
The hot localised points on surface are monitored, and record Temperature Evolution data of the tack-weld during entire fatigue test.
S3, the primitive relation for determining fatigue temperature rise and cycle cycle under different loads level；Wherein, which is different
The difference of the stainless steel side nugget of kind material tack-weld and the maximum temperature and environment maximum temperature of plasticity ring surface hot localised points
Value.
S4, multiple fatigue temperature rises are filtered with recycling the primitive relation of cycle, obtained different loads water
Evolution trend of the flat lower fatigue temperature rise with recycling cycle；Wherein, the evolution trend of the fatigue temperature rise and cycle cycle includes four
Stage, first stage are the quick boost phase of temperature, and second stage is the temperature decline stage, and the phase III stablizes raising for temperature
Stage, fourth stage are cooling stage.
Wherein, in order to which united analysis compares, by each moment tack-weld sample SUS301L stainless steels side nugget and plasticity
The maximum temperature of ring surface hot localised points and the difference of environment maximum temperature are as fatigue temperature rise Δ T, to recycle cycle N as horizontal seat
Mark, using fatigue temperature rise Δ T as ordinate, establishes the original temperature evolution curve of xenogenesis tack-weld fatigue process.With load-carrying water
For putting down the sample for 7.0KN.Due to the presence of buoyancy effect, the original temperature of dissimilar material tack-weld fatigue process is one
A process constantly shaken need to be filtered it by Matlab softwares, and tack-weld is obtained to eliminate buoyancy effect
The overall trend of fatigue process Temperature Evolution.The bulk temperature evolution trend obtained after Matlab is filtered is as shown in figure 4, wherein
(a) photo shot under visible light for dissimilar material tack-weld sample, (b) to (f) are the infrared heat corresponding to key point
As figure.It can be seen that SUS301L-Q235B dissimilar materials tack-weld nugget and plasticity ring surface office under Cyclic Load
The temperature change of portion's hot spot divides four-stage, i.e., by (b) to (c) temperature rapid increase stage, by (c) to (d) at a temperature of
Depression of order section, by (d) to (f) temperature stablize ascent stage and subsequent natural cooling stage, this related proof gold with report
There are obvious differences for the characteristic feature of category material " three phases " and banjo fixing butt jointing " five stages ".First, entire fatigue
The fatigue temperature rise value of process is little, this is because what tack-weld design feature in itself and the geometric dimension of sample were determined,
The position i.e. hot source point that tack-weld bears circulation shear stretching is located at nugget center, and sample table is transferred heat to by 4mm plate thickness
Face, heat dissipation it is more, can only monitor the several years even zero several years temperature rise value, but this do not influence tired Temperature Evolution overall trend and
The further investigation being unfolded therefrom；Again, (c) place peak value formed is quickly increased by first stage temperature far below final
Corresponding (f) place peak value is broken, this is because tack-weld, compared with simple metal or banjo fixing butt jointing sample, bearing capacity is low, applies
Loading lotus is small, and the mechanical energy of external world's input is few；In addition, do not occur the temperature stabilised platform stage, for occupying entire tired mistake
The phase III of journey overwhelming majority cycle, temperature are one and stablize raised process, and the fatigue temperature rise of entire phase III is oblique
Rate is a stationary value.
In order to further investigate the internal relation of fatigue temperature rise and fatigue limit, by the fatigue temperature rise of seven tack-weld samples
Relation curve with recycling cycle is established under the same coordinate system, as shown in Figure 5.As can be seen that with the raising of load level,
The peak value of fatigue temperature rise gradually rises, and rate of temperature change, that is, raised temperature of unit cycle is bigger.Wherein, load level is
The sample of 5.0KN and 6.5KN is not broken when recycling cycle and reaching 2,000,000 preset times, and fatigue temperature rise is one
Platform is shaken, temperature knots modification is smaller；And there is notable temperature change in the sample that fatigue fracture occurs.Therefore, attempting will
Temperature rises slope and the critical point that the corresponding magnitude of load of turnover changes as Fatigue Damage Mechanism occurs, and is predicted with this different
The fatigue limit of kind material tack-weld.
S5, the fatigue temperature rise slope corresponding to each load level in the phase III is determined；Wherein, the fatigue temperature rise slope
The fatigue temperature rise knots modification of million times is recycled for cycle cycle.
S6, multiple fatigue temperature rise slopes by specified rule are divided, obtains two groups of fatigue temperature rise slope datas.
Wherein, it is described that multiple fatigue temperature rise slopes are divided by specified rule, it obtains two groups of temperature and rises slope data packet
It includes：
Slope is risen to temperature and is divided into one group less than or equal to specified threshold.
Slope is risen to temperature and is divided into one group more than specified threshold.
The specified threshold is empirical value, in embodiments of the present invention, can the threshold value be set as 0.5.
S7, it two groups of fatigue temperature rise slope datas is carried out with linear fit respectively obtains two linear equations, by the friendship of two straight lines
The corresponding load-carrying water level values of point are the fatigue limit predicted value of dissimilar material tack-weld.
Wherein, the relational graph between phase III temperature liter slope and load level is established, as shown in Figure 6.It can not be ugly from figure
Go out, the temperature liter slope corresponding to load level 5.0KN, 5.5KN and 6.5KN is very small, and less than specified threshold 0.5, remaining four
The temperature of a load level rises slope and significant changes has occurred.In order to determine that it is big that this temperature rises the corresponding load of slope appearance turnover
It is small, and in this, as fatigue limit predicted value, linear fit is carried out to two groups of fatigue temperature rise slope datas respectively, two straight lines can be obtained
Equation is respectively：
θ1=0.000278567F+0.12346 (1)
θ2=1.12259F-6.12676 (2)
Wherein, by (1) formula with (2) formula simultaneous, the abscissa corresponding to two straight-line intersections is 5.569KN.Therefore, it obtains different
The fatigue limit predicted value of kind material tack-weld is 5.569KN.
In addition, in order to verify the authenticity and reliability of fatigue limit Forecasting Methodology of the present invention, staircase method has then been carried out
Fatigue test.
S8, dissimilar material tack-weld is predicted using staircase method to obtain fatigue limit test value.
S9, the fatigue limit predicted value and the fatigue limit test value are compared, obtain error amount.
Staircase method fatigue verification test
According to GB/T15111-94《Tack-weld shear tension fatigue test method》Standard is used as using 2X106 times and sentenced
Other standard carries out fatigue test, when sample is more than preset loop cycle 2X106And apparent macroscopic cracking is not generated, it is considered as " logical
Cross ", otherwise it is considered as " not passing through ".Rule of thumb and the size of tack-weld static tension experiment gained tensile strength determines fatigue
Initial load size is tested, the fatigue load amplitude applied in fatigue test is since 7KN, if test specimen does not have in preceding primary experiment
Have and pass through, then by load reduction 0.5KN in test next time；Conversely, then increase 0.5KN.Add according to this rule in identical
Repeat fatigue test under carrier frequency rate and stress ratio, according to GB/T24178-2009《Metal Material Fatigue test data counts
Scheme and analysis method》, it is minimum to choose 8 samples for explaining experiment, under 4 equidistant load levels, each load
Two samples of horizontal checkout, result of the test are as shown in Figure 7.
It is for statistical analysis to test data, the dissimilar material tack-weld can be obtained in 2X106Recycle institute under cycle
Corresponding fatigue limit is：
Wherein, using the method for the present invention fatigue limit predicted value compared with the fatigue limit test value obtained using staircase method
Compared with, and calculate its error：
Therefore, δ is the error of fatigue limit predicted value and fatigue limit test value, and δ is 5.21%, has higher one
Cause property can realize the fast prediction of dissimilar material tack-weld fatigue limit, meanwhile, method proposed by the invention is expected to as not
The research of the heterogeneous welds structure military service behavior such as uniform thickness dissimilar material provides theoretical direction and technical support.
Nugget and plasticity under Cyclic Load by SUS301L-Q235B dissimilar materials tack-weld of the embodiment of the present invention
The temperature change of ring surface hot localised points is divided into four-stage, and with the raising of load level, the peak value of fatigue temperature rise gradually rises
Height, and rate of temperature change, that is, raised temperature of unit cycle is bigger.And the fatigue temperature rise slope of entire phase III is one steady
Definite value.Therefore using by determining the fatigue temperature rise slope in the phase III corresponding to each load level；To multiple fatigue temperature
It rises slope to be divided by specified rule, obtains two groups of fatigue temperature rise slope datas；Two groups of fatigue temperature rise slope datas are distinguished
It carries out linear fit and obtains two straight lines, be the tired of dissimilar material tack-weld by the load-carrying water level values corresponding to the intersection point of two straight lines
Labor limit predicted value changes that is, temperature is risen slope and the corresponding magnitude of load of turnover occurs as Fatigue Damage Mechanism
Critical point, and predict with this fatigue limit of dissimilar material tack-weld, the predicted value for obtaining tack-weld fatigue limit is
5.569KN, and staircase method fatigue verification test has been carried out, it obtains the dissimilar material tack-weld and is recycled under cycle in 2X106
Corresponding fatigue limit is 5.875KN, and the error between predicted value and test value is 5.21%, has higher consistency.
Disclosed above is only several specific embodiments of the present invention, and those skilled in the art can carry out the present invention
Various modification and variations without departing from the spirit and scope of the present invention, if these modifications and changes of the present invention belong to the present invention
Within the scope of claim and its equivalent technologies, then the present invention is also intended to include these modifications and variations.
Claims (6)
1. a kind of dissimilar material tack-weld fatigue limit method for quick predicting, which is characterized in that including：
S1, one layer of uniform black matte paint is sprayed on fatigue testing specimen surface, the radiance of the black matte paint is 0.9；Wherein,
The fatigue testing specimen is prepared for dissimilar material tack-weld；
S2, the stainless steel side nugget for monitoring dissimilar material tack-weld in real time using thermal infrared imager and plasticity ring surface localized heat
The temperature of point；
S3, the primitive relation for determining fatigue temperature rise and cycle cycle under different loads level；Wherein, the fatigue temperature rise is xenogenesis
The difference of the stainless steel side nugget of material tack-weld and the maximum temperature of plasticity ring surface hot localised points and environment maximum temperature；
S4, multiple fatigue temperature rises are filtered with recycling the primitive relation of cycle, obtained different loads are horizontal
The evolution trend of lower fatigue temperature rise and cycle cycle；Wherein, the evolution trend of the fatigue temperature rise and cycle cycle includes four
Stage, first stage are the quick boost phase of temperature, and second stage is the temperature decline stage, and the phase III stablizes raising for temperature
Stage, fourth stage are cooling stage；
S5, the fatigue temperature rise slope corresponding to each load level in the phase III is determined；Wherein, the fatigue temperature rise slope is
Recycle the fatigue temperature rise knots modification that cycle recycles million times；
S6, multiple fatigue temperature rise slopes by specified rule are divided, obtains two groups of fatigue temperature rise slope datas；
S7, it two groups of fatigue temperature rise slope datas is carried out with linear fit respectively obtains two linear equations, and by the intersection point of two straight lines
Fatigue limit predicted value of the corresponding load-carrying water level values as dissimilar material tack-weld.
2. dissimilar material tack-weld fatigue limit method for quick predicting according to claim 1, which is characterized in that described
Linear fit is carried out respectively to two groups of fatigue temperature rise slope datas and obtains two linear equations, two linear equations are respectively：
θ1=0.000278567F+0.12346
θ2=1.12259F-6.12676
Wherein, F is load level, θ1Slope, θ are risen for the first temperature2Slope is risen for the second temperature.
3. dissimilar material tack-weld fatigue limit method for quick predicting according to claim 1, which is characterized in that described
Multiple fatigue temperature rise slopes by specified rule are divided, two groups of temperature is obtained and rises slope data, including：
Temperature is risen into slope and is divided into one group less than or equal to the fatigue temperature rise slope of specified threshold；
Temperature is risen into slope and is divided into one group more than the fatigue temperature rise slope of specified threshold.
4. dissimilar material tack-weld fatigue limit method for quick predicting according to claim 1, which is characterized in that described
It is further included after step S7：
S8, dissimilar material tack-weld is predicted using staircase method, obtains fatigue limit test value；
S9, the fatigue limit predicted value and the fatigue limit test value are compared, obtain error amount.
5. dissimilar material tack-weld fatigue limit method for quick predicting according to claim 1, which is characterized in that described
Dissimilar material is that the SUS301L stainless steels of 4mm and Q235B mild steel form by thickness.
6. dissimilar material tack-weld fatigue limit method for quick predicting according to claim 1, which is characterized in that described
The sensitivity of thermal infrared imager is less than 0.03 DEG C, and temperature range is -20 DEG C~1200 DEG C, and image capture frequency is 9Hz.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109241660A (en) * | 2018-09-27 | 2019-01-18 | 哈尔滨工业大学 | A kind of carrying design method such as butt welded joint fatigue |
| CN109596425A (en) * | 2019-01-09 | 2019-04-09 | 江西江铃集团新能源汽车有限公司 | A kind of lap joint Evaluation Method of Mechanical Property |
| CN111198140A (en) * | 2020-02-10 | 2020-05-26 | 大连交通大学 | Method for rapidly predicting fatigue limit of welding joint based on fatigue damage entropy production rate |
| CN112284942A (en) * | 2020-10-23 | 2021-01-29 | 哈尔滨工业大学 | Thermal boundary condition control method for fatigue limit evaluation of welding joint |
| CN112924307A (en) * | 2021-01-29 | 2021-06-08 | 有研工程技术研究院有限公司 | Fatigue limit rapid prediction method based on infrared thermal imaging |
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| CN112924307B (en) * | 2021-01-29 | 2023-01-20 | 有研工程技术研究院有限公司 | Fatigue limit rapid prediction method based on infrared thermal imaging |
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